I was just looking for some advice on skimmers. Im wondering do i need to use one or not. And could you advise me on which would be good for my system. Its a 175L its runs a 750 aquris canister filter a 300L/HR hang on filter and 2 power heads. Have crushed coral for substrate 45K of live rock.FISH IN THAT TANK 1 BANNER FISH 1 BI COLOUR ANGEL 1 SAILFIN TANG 1 BLACK RIBBON EEL 1 SHORT SPINE URCHIN So please any advice i would be greatful for. And all the to you and your fish keeping days.:sfish: